Best way to adjust black and white tracking

[TinCanAlley]

I finally found a new video output board for my CCII. After installing it, I adjusted the G2 and let it be to see if the problems I had before were actually caused by the previous board. After about 10 hours of problem free viewing, I was confident it's now fixed.

So now the next issue......I need to adjust the color drives. With all drive controls down, there is a green tint. So I'm assuming the green drive has more output than the red and blue. Since all controls are at minimum, I have to adjust the other two colors. This leads me to my question about how to best adjust the two other colors to get a white raster.

I've tinkered with the red and blue, but always seem to find the screen either a bit too red or blue. I've tried it with the grayscale pattern of Video Essentials as well as a black and white movie. Either way I don't seem to be able to get the whites white and the blacks blacks. There's always a hint of blue or red. I must be missing something or expecting too much.

Any assistance would be greatly appreciated.

Thanks